Properties of Solids & Liquids-Application of Surface Tension (KVPY Stream-SA (Class 11) Physics): Questions 1 - 3 of 3

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Question number: 1

» Properties of Solids & Liquids » Application of Surface Tension

Appeared in Year: 2014

MCQ▾

Question

A box, when hung from a spring balance shows a reading of 50 kg. If the same box is hung from the same spring balance inside an evacuated chamber, the reading on the scale will be.

Choices

Choice (4) Response

a.

More than 50 kg because the atmospheric buoyancy force will be absent

b.

50 kg because the effect of the absence of the atmosphere will be identical on the box and the spring balance

c.

50 kg because the mass of the box remains unchanged

d.

Less than 50 kg because the weight of the column of air on the box will be absent

Question number: 2

» Properties of Solids & Liquids » Application of Surface Tension

Appeared in Year: 2014

MCQ▾

Question

A machine is blowing spherical soap bubbles of different radii filled with helium gas. It is found that if the bubbles have a radius smaller than 1 cm, then they sink to the floor in still air. Larger bubbles float in the air. Assume that the thickness of the soap film in all bubbles is uniform and equal. Assume that the density of soap solution is same as that of water (= 1000 kg m–3). The density of helium inside the bubbles and air are 0.18 kg m–3 and 1.23 kg m–3, respectively. Then the thickness of the soap film of the bubbles is (note 1 μm = 10–6 m)

Choices

Choice (4) Response

a.

7.00 μm

b.

0.50 μm

c.

1.50 μm

d.

3.60 μm

Question number: 3

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

In a surface tension experiment with a capillary tube, water rises up to 0.2 m. If the same experiment is repeated in an artificial satellite, which is revolving around the earth, water will rise in the capillary up to a height of,

Choices

Choice (4) Response

a.

0.4 m

b.

Full length of capillary tube

c.

0.2 m

d.

0.8m

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